Inductive Charging Cooling Apparatus With Capillary Wick Paths

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Solution Overview

Problem

Contactless charging of mobile electronic devices generates unwanted heat, which can damage batteries and other components due to increased charging rates.

Innovation Solution

A charging apparatus with a cooling system using phase-change cooling fluid transported via capillary action through wick structures, evaporated at the interface with the device, and condensed back into a liquid phase to circulate and cool the device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If contactless charging rate is increased, then charging speed is improved, but heat generation increases causing thermal damage to battery and components

Engineering Contradiction:
Improvecharging speedVSAvoidheat generation
Core Design Contradiction:
ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent employs phase-change cooling fluid that transitions between liquid and vapor phases to absorb and remove heat generated during contactless charging. The fluid evaporates at the heating element, absorbing latent heat, then condenses back to liquid in the condenser, releasing heat externally. This phase transition mechanism enables effective heat dissipation while maintaining high charging rates.

Inventive Principle:
Principle #36Phase transitions

Solution Approach 2:

The cooling fluid acts as an intermediary substance between the heat source (heating element/ battery) and the external environment. It absorbs heat from the battery through capillary wick structures, transports it via phase change, and dissipates it externally, thereby protecting the battery from thermal damage while enabling high-speed charging.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Temperature

If phase-change cooling fluid is used for cooling, then heat dissipation is improved, but device complexity increases due to additional cooling system components

Engineering Contradiction:
Improveheat dissipation efficiencyVSAvoidcooling system structure
Core Design Contradiction:
TemperatureVSDevice complexity

Solution Approach 1:

The cooling system is designed to be self-regulating through capillary action. The wick structures automatically draw the cooling fluid from the reservoir to the evaporator surface without requiring external pumps or complex control mechanisms. The phase-change process itself regulates fluid circulation, reducing the need for additional active cooling components and simplifying the overall system.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent utilizes capillary hydraulic principles where the wick structures function as passive fluid transport channels. The cooling fluid moves through the wick material driven by capillary pressure gradients created by the phase-change process, eliminating the need for mechanical pumps or complex hydraulic control systems while maintaining effective heat removal.

Inventive Principle:
Principle #29Pneumatics and hydraulics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Effectively dissipates heat generated during contactless charging, protecting the device from thermal damage and maintaining operational efficiency.

Implementation Method 1

the flow path means comprises wick structures that enable the phase-change fluid to be transported via capillary action

Methodology Applied
Scientific EffectCapillary action: Capillary Action

Implementation Method 2

evaporator means for enabling evaporation of the phase-change cooling fluid wherein the evaporator means are provided at the interface with the mobile apparatus so as to enable cooling of, at least part of, the mobile apparatus

Methodology Applied
Scientific EffectEvaporation: Evaporation

Implementation Method 3

phase-change cooling fluid to an interface with the mobile apparatus so as to enable cooling of, at least part of, the mobile apparatus

Methodology Applied
Scientific EffectPhase change: Phase Change

Implementation Method 4

condenser means for condensing phase-change cooling fluid from the atmosphere to enable the condensed phase-change cooling fluid to be provided to the flow path

Methodology Applied
Scientific EffectCondensation: Condensation

Data Source

PatentUS12435930B2Cooling apparatus
Publication Date: 2025.10.07 NOKIA TECHNOLOGIES OY
  • US12435930B2 patent drawing
  • US12435930B2 patent drawing
  • US12435930B2 patent drawing

AI summary

The application relates to a charging apparatus for inductively charging a separate, mobile apparatus. The charging apparatus includes a cooling system which is configured to enable additional phase change cooling of the mobile apparatus during inductive charging. The charging apparatus includes a flow path for providing a flow path for a phase-change cooling fluid to an interface with the mobile apparatus. The flow path enables cooling of, at least part of, the mobile apparatus when the mobile apparatus is being inductively charged by the charging apparatus. The flow path also includes wick structures that enable the phase-change fluid to be transported via capillary action.